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1 1 This is the only documentation which is allowed during the exam. This sheet should not have any annotation. SQL SYNTAX This document presents the syntax for a subset of instructions in standard SQL. The notation we are using to define the syntax is an extended version of BNF 1. In BNF, each syntactic ter mis defined through a set of production rules. These rules define an element in terms of a formula which is composed of characters, strings and syntactic elements which can be used to construct an instance of that element. In what follows, we include the symbols and rules fo the BNF version we have used: Character string in italics: defines the name of an identifier. Character string in (non-italics) lowercase: it defines the name of a syntax element which is not a terminal symbol and is defined in other production rule. CHARACTER STRING IN UPPERCASE: it is a terminal symbol in the gramar which defines a reserved Word in SQL. ::= The production operator. It is used in a production rule to separate the defined element (on the left) and the form which defines it (on the right). [ ] Square brackets are used to indicate that the elements inside are optional. {} The curly brackets are used to group the elements in a formula. The portion in a formula which is included inside curly brackets must be explicitly specified. A vertical bar is an alternative operator which indicates that two (or more) alternative portions are possible. If xyz is a syntactic element, list_xyz is a list of elements of type xyz which are separated by any kind of separator (blank, newline, etc.). If xyz is a syntactic element, commalist_xyz is a list of elements of type xyz separated by commas. 1 Bakus Normal Form or Bakus Naur Form
2 2 FIRST PART: Data definition 1) schema_definition ::= CREATE SCHEMA [schema] [AUTHORIZATION user] [list_schema_element] 2) schema_element ::= domain_definition table_definition view_definition constraint_definition privilege_definition 3) domain_definition ::= CREATE DOMAIN domain [AS] datatype [default_value_definition] [list_domain_constraint_definition] 4) default_value_definition ::= DEFAULT {literal system_function NULL } 5) domain_constraint_definition ::= [CONSTRAINT constraint] CHECK (conditional_expression) [when_to_check] 6) when_to_check ::= [[NOT] DEFERRABLE] [INITIALLY {IMMEDIATE DEFERRED}] 7) table_definition ::= CREATE TABLE base_table commalist_column_definition [commalist_table_constraint_definition] 8) column_definition ::= column { datatype domain } [default_value_definition] [list_column_constraint_definition] 9) column_constraint_definition ::= [CONSTRAINT constraint ] {NOT NULL PRIMARY KEY UNIQUE REFERENCES table [(commalist_column)] [MATCH {FULL PARTIAL } ] [ON DELETE action_reference] [ON UPDATE action_reference] CHECK (conditional_expression) } [when_to_check]
3 3 10) action_reference ::= NO ACTION CASCADE SET DEFAULT SET NULL 11) table_constraint_definition ::= [CONSTRAINT constraint ] {PRIMARY KEY UNIQUE (commalist_column) FOREIGN KEY (commalist_column) REFERENCES table [(commalist_column)] [MATCH {FULL PARTIAL } ] [ON DELETE action_reference] [ON UPDATE action_reference] CHECK (conditional_expression) } [when_to_check] 12) view_definition ::= CREATE VIEW view [(commalist_column)] AS table_expression [WITH CHECK OPTION] 13) constraint_definition ::= CREATE ASSERTION constraint CHECK (conditional_expression) 14) privilege_definition ::= [when_to_check] GRANT {commalist_privilege ALL PRIVILEGES } ON object TO {commalist_users PUBLIC} [WITH GRANT OPTION] 15) privilege ::= SELECT INSERT [(commalist_column)] UPDATE [(commalist_column)] DELETE 16) object ::= DOMAIN domain [TABLE] table 17) domain_alteration ::= ALTER DOMAIN domain {SET DEFAULT {literal system_function NULL } DROP DEFAULT ADD domain_constraint_definition DROP CONSTRAINT constraint } 18) table_alteration ::= ALTER TABLE base_table {ADD [COLUMN] column_definition ALTER [COLUMN] column {SET DEFAULT {literal system_function NULL } DROP DEFAULT} DROP [COLUMN] column {RESTRICT CASCADE} } 19) schema_removal ::= DROP SCHEMA schema {RESTRICT CASCADE}
4 4 20) domain_removal ::= DROP DOMAIN domain {RESTRICT CASCADE} 21) base_table_removal ::= DROP TABLE base_table {RESTRICT CASCADE} 22) view_removal ::= DROP VIEW view {RESTRICT CASCADE} 23) general_constraint_removal ::= DROP ASSERTION constraint 24) authorisation_removal ::= REVOKE [GRANT OPTION FOR] {ALL SELECT INSERT[(commalist_column)] DELETE UPDATE [(commalist_column)]} ON object TO {commalist_users PUBLIC} {RESTRICT CASCADE} Data Manipulation Table expressions 25) table_expression ::= table_join_expression no_table_join_expression 26) table_join_expression ::= table_reference [NATURAL] [join_type] JOIN table_reference [ON conditional_expression USING (commalist_column) ] (table_expression) CROSS JOIN table_reference (table_join_expression) 27) table_reference ::= table [[AS] run_variable] (table_expression) [[AS] run_variable] table_join_expression 28) join_type ::= INNER LEFT [OUTER] RIGHT [OUTER] FULL [OUTER] UNION 29) table_set_expression ::= table_set_term table_expression {UNION EXCEPT } [ALL] [CORRESPONDING [BY (commalist_column)]] table_term 30) table_set_term ::= primary_set_table table_term INTERSECT [ALL] [CORRESPONDING [BY (commalist_column)]] primary_table
5 5 31) table_term ::= table_set_term table_join_expression 32) primary_table ::= primary_set_table table_join_expression 33) primary_set_table ::= TABLE table table_constructor expression_select (table_set_expression) 34) table_constructor ::= VALUES commalist_row_constructor 35) row_constructor ::= scalar_expression (commalist_scalar_expression) (table_expression) 36) expression_select ::= SELECT [ALL DISTINCT] commalist_selected_item FROM commalist_table_reference [WHERE conditional_expression] [GROUP BY commalist_column [HAVING conditional_expression]] 37) selected_item ::= scalar_expression [AS] column [run_variable.]* Data modification 38) insertion ::= INSERT INTO table { [(commalist_column)] table_expression DEFAULT VALUES } 39) update ::= UPDATE table SET commalist_assignment [WHERE conditional_expression] 40) assignment ::= column = {scalar_expression DEFAULT NULL } 41) removal ::= DELETE FROM table [WHERE conditional_expression] Conditional expressions 42) conditional_expression ::= conditional_term conditional_expression OR conditional_term 43) conditional_term ::= conditional_factor conditional_term AND conditional_factor 44) conditional_factor ::= [NOT] conditional_check
6 6 45) conditional_check ::= primary_condition [IS [NOT] {TRUE FALSE} ] 46) primary_condition ::= simple_condition (conditional_expression) 47) simple_condition ::= comparison_condition between_condition like_condition in_condition null_check match_condition all_any_condition exists_condition unique_condition 48) comparison_condition ::= row_constructor comparison_predicate row_constructor 49) comparison_predicate ::= = < <= > >= <> 50) between_condition ::= row_constructor [NOT] BETWEEN row_constructor AND row_constructor 51) like_condition ::= string_expression [NOT] LIKE pattern [ESCAPE escape] 52) in_condition ::= constructor_file [NOT] IN (table_expression) scalar_expression [NOT] IN (commalist_scalar_expression) 53) null_check ::= row_constructor IS [NOT] NULL 54) match_condition ::= row_constructor MATCH [UNIQUE] [PARTIAL FULL] (table_expression) 55) all_any_condition ::= row_constructor comparison_predicate {ALL ANY SOME}(table_expression) 56) ) exists_condition ::= EXISTS (table_expression) 57) unique_condition ::= UNIQUE (table_expression) Scalar expression 58) scalar_expression ::= numeric_expression string_expression 59) numeric_expression ::= numeric_term numeric_expression {+ -} numeric_term 60) numeric_term ::= numeric_factor numeric_term {* /} numeric_factor 61) numeric_factor ::= [+ -] primary_number 62) primary_number ::= column_reference literal scalar_function_reference aggregated_function_reference (table_expression) (numeric_expression)
7 7 63) aggregated_function_reference ::= COUNT(*) {AVG MAX MIN SUM COUNT } ([ALL DISTINCT] scalar_expression) 64) string_expression ::= string_concatenation primary_string 65) string_concatenation ::= string_expression 2 primary_string 66) primary_string ::= column_reference literal user_function scalar_function_reference aggregated_function_reference (table_expression) (string_expression) Miscellaneous 67) table ::= base_table view 68) pattern ::= string_expression 69) escape ::= string_expression 70) system_function ::= user_function time_function 71) user_function ::= USER CURRENT_USER SESSION_USER SYSTEM_USER 72) time_function ::= CURRENT_DATE CURRENT_TIME CURRENT_TIMESTAMP 2 is the concatenation operator for strings
8 8 In order to ease the handling of this document, in what follows we include all the syntactic categories in SQL99 in alphabetical order. We indicate the number which shows the order to be used to locate them. action_reference 10) aggregated_function_reference 63) all_any_condition 55) assignment 40) authorisation_removal 24) base_table_removal 21) between_condition 50) column_constraint_definition 9) column_definition 8) comparison_condition 48) comparison_predicate 49) conditional_check 45) conditional_expression 42) conditional_factor 44) conditional_term 43) constraint_definition 13) default_value_definition 4) domain_alteration 17) domain_constraint_definition 5) domain_definition 3) domain_removal 20) escape 69) exists_condition 56) expression_select 36) general_constraint_removal 23) in_condition 52) insertion 38) join_type 28) like_condition 51) match_condition 54) null_check 53) numeric_expression 59) numeric_factor 61) numeric_term 60) object 16) pattern 68) primary_condition 46) primary_number 62) primary_set_table 33) primary_string 66)
9 primary_table 32) privilege 15) privilege_definition 14) removal 41) row_constructor 35) scalar_expression 58) schema_definition 1) schema_element 2) schema_removal 19) selected_item 37) simple_condition 47) string_concatenation 65) string_expression 64) system_function 70) table 67) table_alteration 18) table_constraint_definition 11) table_constructor 34) table_definition 7) table_expression 25) table_join_expression 26) table_reference 27) table_set_expression 29) table_set_term 30) table_term 31) time_function 72) unique_condition 57) update 39) user_function 71) view_definition 12) view_removal 22) when_to_check 6) 9
10 SECOND PART: STANDARD SQL IN ORACLE (DEFINITION LANGUAGE: TABLES AND TRIGGERS) In what follows we present the syntax of the instructions in Oracle which do not follow standar SQL: Definition of a basic relation 1) basic_relation_definition ::= CREATE TABLE relation_name (commalist_basic_relation_element) 2) basic_relation_element ::= attribute_definition relation_constraint 3) attribute_definition ::= attribute_name datatypes [DEFAULT (expression)] [list_attribute_constraint] 4) datatypes ::= CHAR (length) VARCHAR (length) NUMBER [(precision[, scale])] DATE 5) attribute_constraint ::= [CONSTRAINT constraint_name] {[NOT] NULL UNIQUE PRIMARY KEY REFERENCES relation_name [(attribute_name)] [ON DELETE CASCADE] CHECK (conditional_expression) } [when_to_check] 6) relation_constraint ::= [CONSTRAINT constraint_name] { UNIQUE (commalist_attribute_name) PRIMARY KEY (commalist_attribute_name) FOREIGN KEY (commalist_attribute_name) REFERENCES relation_name [(commalist_attribute_name)] [ON DELETE CASCADE] CHECK (conditional_expression)} [when_to_check] 7) when_to_check:= [[NOT] DEFERRABLE] [INITIALLY {IMMEDIATE DEFERRED}] 8) relation_alteration ::= ALTER TABLE relation_name {ADD (commalist_basic_relation_element) MODIFY (commalist_attribute_definition) {DROP [VALIDATE NOVALIDATE] ENABLE DISABLE } (constraint) } 10
11 11 9) constraint ::= {PRIMARY [CASCADE] UNIQUE (commalist_attribute_name) [CASCADE] CONSTRAINT constraint_name } 10) view_definition ::= CREATE [OR REPLACE] VIEW view_name [(commalist_attribute_name)] AS expression_select [WITH CHECK OPTION] 11) grant_operation_definition ::= GRANT commalist_privilege TO {PUBLIC commalist_user} [WITH ADMIN OPTION] 12) rule_definition := {CREATE REPLACE} TRIGGER rule_name {BEFORE AFTER INSTEAD OF} event [event_disjunction] ON {relation_name view_name} [ [REFERENCING OLD AS reference_name [NEW AS reference_name] ] [FOR EACH ROW [WHEN ( conditional_expression ) ] ] PL/SQL block 13) event_disjunction := OR event [event_disjunction] 14) event := INSERT DELETE UPDATE [OF commalist_attribute_name] Annex: Language PL/SQL Structure of a PL/SQL block: DECLARE Section for variable declaration; BEGIN Block sentences; END Section for variable declaration: variable_name datatype datatype::= {NUMBER CHAR( ) DATE } Sentences in a PL/SQL block: sentence_sequence::= sentence; [sentence_sequence;] IF condition THEN sentence_sequence [ ELSE sentence_sequence] END IF; WHILE condition LOOP sentence_sequence; END LOOP; FOR counter IN minimum.. maximum LOOP sentence_sequence ; END LOOP - Assignment: variable_name := expression - Sentences SQL: INSERT, DELETE, UPDATE, SELECT... INTO... Error handling: RAISE_APPLICATION_ERROR (error_number, ' message' ) Input-output sentences: dbms_output.put_line ('message').
12 In order to ease the handling of the syntax for Oracle, in what follows we include all the syntactic categories seen above in alphabetical order. We indicate the number which shows the order to be used to locate them. attribute_constraint 5 attribute_definition 3 basic_relation_definition 1 basic_relation_element 2 constraint 9 datatypes 4 event 14 event_disjunction 13 grant_operation_definition 11 relation_alteration 8 relation_constraint 6 rule_definition 12 view_definition 10 when_to_check 7 12
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